Organometallic Polymers as Precursors to Ceramic Materials: Silicon Nitride and Silicon Oxynitride.

Abstract

We have found that a large variety of homogeneous and heterogeneous catalysts will promote the formation of silicon-nitrogen bonds via a dehydrocoupling coupling reaction of Silicon hydrogen bonds with Nitrogen hydrogen bonds. This reaction can be used to synthesize a wide variety of tractable oligo- and polysilazanes. The molecular weight, the viscoelastic properties and the linearrity of the polymer can be controlled through proper choice of catalyst and reaction conditions. In addition, the catalyst promotes polymer crosslinking during pyrolysis which leads to high ceramic yields and silicon nitride purities > 95%. Keywords: Polysilazanes; Preceramic polymers; Activation catalysis; Si2N2; silanes; Ammonia; Amines; Si2ON2

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Document Details

Document Type
Technical Report
Publication Date
Feb 23, 1987
Accession Number
ADA178136

Entities

People

  • Andrea Chow
  • Richard D. Hamlin
  • Richard M Laine
  • Yigal D. Blum

Organizations

  • SRI International

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Catalysts
  • Ceramic Materials
  • Chemical Compounds
  • Chemistry
  • Composite Materials
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Military Research
  • Molecular Weight
  • Nitrides
  • Nitrogen Compounds
  • Physical Properties
  • Polymer Chemistry
  • Silicon Carbide
  • X Rays

Fields of Study

  • Chemistry

Readers

  • Organic Chemistry
  • Polymer Science and Technology
  • Powder metallurgy of Titanium alloys.